From 022dfd0f42962da6c60fbeb5604e1455a07eaaa6 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 20 Jan 2022 16:28:18 -0700
Subject: Added System Timer Hook

---
 src/cpu/irq.c     |  4 ++++
 src/sys/core.c    |  1 +
 src/util/status.c |  9 +++++++++
 src/util/time.c   | 14 ++++++++++++++
 4 files changed, 28 insertions(+)

(limited to 'src')

diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index f1d8fb6..fb73b8a 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -102,6 +102,8 @@ void c_irq_handler(void)
 	} else if (source & (1 << 3)) {
 		c_timer();
 		return;
+	} else {
+		uart_string("Unknown Interrupt Detected!");
 	}
 	return;
 }
@@ -196,6 +198,8 @@ void c_fiq_handler(void)
 	} else if (source & (1 << 3)) {
 		c_timer();
 		return;
+	} else {
+		uart_string("Unknown Interrupt Detected!");
 	}
 	return;
 }
diff --git a/src/sys/core.c b/src/sys/core.c
index 0b4b91a..d658d90 100644
--- a/src/sys/core.c
+++ b/src/sys/core.c
@@ -33,6 +33,7 @@ void sysinit(void)
 	cmdidx = 0;
 	for(int i = 0; i < 2048; i++)
 		cmd[i] = 0;
+	*(unsigned long*) SYS_TIMER_C0 = 60000000; // 60 second trigger
 	///...
 
 	// Route GPU interrupts to Core 0
diff --git a/src/util/status.c b/src/util/status.c
index dd2b899..7abf931 100644
--- a/src/util/status.c
+++ b/src/util/status.c
@@ -162,6 +162,15 @@ void status(void)
 	"and %0, %0, #3" : "=r"(coren) :: "cc");
 	write_string(&g_Drawer, "Status Updated by Core #");
 	write_10(&g_Drawer, coren);
+	write_string(&g_Drawer, "\nSys Timer Status: ");
+	coren = *(unsigned long*)SYS_TIMER_CS;
+	write_10(&g_Drawer, coren);
+	write_string(&g_Drawer, " : ");
+	unsigned long long tval = get_time();
+	write_hex32(&g_Drawer, (tval >> 32));
+	write_hex32(&g_Drawer, tval);
+	write_char(&g_Drawer, '\n');
+	write_10(&g_Drawer, ((unsigned long)tval)/1000000);
 
 	g_Drawer.x = x;
 	g_Drawer.y = y;
diff --git a/src/util/time.c b/src/util/time.c
index a0c539b..e9e5716 100644
--- a/src/util/time.c
+++ b/src/util/time.c
@@ -51,3 +51,17 @@ unsigned long read_cntfrq(void)
 	asm volatile ("mrc p15, 0, %0, c14, c0, 0" : "=r"(val) );
 	return val;
 }
+
+unsigned long long get_time(void)
+{
+	union {
+		unsigned long long tval;
+		struct {
+			unsigned long high;
+			unsigned long low;
+		} tvalb;
+	} t;
+	t.tvalb.low = *(unsigned long*)SYS_TIMER_CLO;
+	t.tvalb.high = *(unsigned long*)SYS_TIMER_CHI;
+	return t.tval;
+}
-- 
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